/*
* Copyright 2003 NVIDIA , Corporation
* Copyright 2006 Dave Airlie
* Copyright 2007 Maarten Maathuis
* Copyright 2007 - 2009 Stuart Bennett
*
* Permission is hereby granted , free of charge , to any person obtaining a
* copy of this software and associated documentation files ( the " Software " ) ,
* to deal in the Software without restriction , including without limitation
* the rights to use , copy , modify , merge , publish , distribute , sublicense ,
* and / or sell copies of the Software , and to permit persons to whom the
* Software is furnished to do so , subject to the following conditions :
*
* The above copyright notice and this permission notice ( including the next
* paragraph ) shall be included in all copies or substantial portions of the
* Software .
*
* THE SOFTWARE IS PROVIDED " AS IS " , WITHOUT WARRANTY OF ANY KIND , EXPRESS OR
* IMPLIED , INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY ,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT . IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM , DAMAGES OR OTHER
* LIABILITY , WHETHER IN AN ACTION OF CONTRACT , TORT OR OTHERWISE , ARISING
* FROM , OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE .
*/
#include <drm/drm_modeset_helper_vtables.h>
#include "nouveau_drv.h"
#include "nouveau_encoder.h"
#include "nouveau_connector.h"
#include "nouveau_crtc.h"
#include "hw.h"
#include "nvreg.h"
#include <subdev/bios/gpio.h>
#include <subdev/gpio.h>
#include <nvif/timer.h>
int nv04_dac_output_offset(struct drm_encoder *encoder)
{
struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
int offset = 0 ;
if (dcb->or & (8 | DCB_OUTPUT_C))
offset += 0 x68;
if (dcb->or & (8 | DCB_OUTPUT_B))
offset += 0 x2000;
return offset;
}
/*
* arbitrary limit to number of sense oscillations tolerated in one sample
* period ( observed to be at least 13 in " nvidia " )
*/
#define MAX_HBLANK_OSC 20
/*
* arbitrary limit to number of conflicting sample pairs to tolerate at a
* voltage step ( observed to be at least 5 in " nvidia " )
*/
#define MAX_SAMPLE_PAIRS 10
static int sample_load_twice(struct drm_device *dev, bool sense[2 ])
{
struct nouveau_drm *drm = nouveau_drm(dev);
struct nvif_object *device = &drm->client.device.object;
int i;
for (i = 0 ; i < 2 ; i++) {
bool sense_a, sense_b, sense_b_prime;
int j = 0 ;
/*
* wait for bit 0 clear - - out of hblank - - ( say reg value 0 x4 ) ,
* then wait for transition 0 x4 - > 0 x5 - > 0 x4 : enter hblank , leave
* hblank again
* use a 10 ms timeout ( guards against crtc being inactive , in
* which case blank state would never change )
*/
if (nvif_msec(&drm->client.device, 10 ,
if (!(nvif_rd32(device, NV_PRMCIO_INP0__COLOR) & 1 ))
break ;
) < 0 )
return -EBUSY;
if (nvif_msec(&drm->client.device, 10 ,
if ( (nvif_rd32(device, NV_PRMCIO_INP0__COLOR) & 1 ))
break ;
) < 0 )
return -EBUSY;
if (nvif_msec(&drm->client.device, 10 ,
if (!(nvif_rd32(device, NV_PRMCIO_INP0__COLOR) & 1 ))
break ;
) < 0 )
return -EBUSY;
udelay(100 );
/* when level triggers, sense is _LO_ */
sense_a = nvif_rd08(device, NV_PRMCIO_INP0) & 0 x10;
/* take another reading until it agrees with sense_a... */
do {
udelay(100 );
sense_b = nvif_rd08(device, NV_PRMCIO_INP0) & 0 x10;
if (sense_a != sense_b) {
sense_b_prime =
nvif_rd08(device, NV_PRMCIO_INP0) & 0 x10;
if (sense_b == sense_b_prime) {
/* ... unless two consecutive subsequent
* samples agree; sense_a is replaced */
sense_a = sense_b;
/* force mis-match so we loop */
sense_b = !sense_a;
}
}
} while ((sense_a != sense_b) && ++j < MAX_HBLANK_OSC);
if (j == MAX_HBLANK_OSC)
/* with so much oscillation, default to sense:LO */
sense[i] = false ;
else
sense[i] = sense_a;
}
return 0 ;
}
static enum drm_connector_status nv04_dac_detect(struct drm_encoder *encoder,
struct drm_connector *connector)
{
struct drm_device *dev = encoder->dev;
struct nvif_object *device = &nouveau_drm(dev)->client.device.object;
struct nouveau_drm *drm = nouveau_drm(dev);
uint8_t saved_seq1, saved_pi, saved_rpc1, saved_cr_mode;
uint8_t saved_palette0[3 ], saved_palette_mask;
uint32_t saved_rtest_ctrl, saved_rgen_ctrl;
int i;
uint8_t blue;
bool sense = true ;
/*
* for this detection to work , there needs to be a mode set up on the
* CRTC . this is presumed to be the case
*/
if (nv_two_heads(dev))
/* only implemented for head A for now */
NVSetOwner(dev, 0 );
saved_cr_mode = NVReadVgaCrtc(dev, 0 , NV_CIO_CR_MODE_INDEX);
NVWriteVgaCrtc(dev, 0 , NV_CIO_CR_MODE_INDEX, saved_cr_mode | 0 x80);
saved_seq1 = NVReadVgaSeq(dev, 0 , NV_VIO_SR_CLOCK_INDEX);
NVWriteVgaSeq(dev, 0 , NV_VIO_SR_CLOCK_INDEX, saved_seq1 & ~0 x20);
saved_rtest_ctrl = NVReadRAMDAC(dev, 0 , NV_PRAMDAC_TEST_CONTROL);
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_TEST_CONTROL,
saved_rtest_ctrl & ~NV_PRAMDAC_TEST_CONTROL_PWRDWN_DAC_OFF);
msleep(10 );
saved_pi = NVReadVgaCrtc(dev, 0 , NV_CIO_CRE_PIXEL_INDEX);
NVWriteVgaCrtc(dev, 0 , NV_CIO_CRE_PIXEL_INDEX,
saved_pi & ~(0 x80 | MASK(NV_CIO_CRE_PIXEL_FORMAT)));
saved_rpc1 = NVReadVgaCrtc(dev, 0 , NV_CIO_CRE_RPC1_INDEX);
NVWriteVgaCrtc(dev, 0 , NV_CIO_CRE_RPC1_INDEX, saved_rpc1 & ~0 xc0);
nvif_wr08(device, NV_PRMDIO_READ_MODE_ADDRESS, 0 x0);
for (i = 0 ; i < 3 ; i++)
saved_palette0[i] = nvif_rd08(device, NV_PRMDIO_PALETTE_DATA);
saved_palette_mask = nvif_rd08(device, NV_PRMDIO_PIXEL_MASK);
nvif_wr08(device, NV_PRMDIO_PIXEL_MASK, 0 );
saved_rgen_ctrl = NVReadRAMDAC(dev, 0 , NV_PRAMDAC_GENERAL_CONTROL);
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_GENERAL_CONTROL,
(saved_rgen_ctrl & ~(NV_PRAMDAC_GENERAL_CONTROL_BPC_8BITS |
NV_PRAMDAC_GENERAL_CONTROL_TERMINATION_75OHM)) |
NV_PRAMDAC_GENERAL_CONTROL_PIXMIX_ON);
blue = 8 ; /* start of test range */
do {
bool sense_pair[2 ];
nvif_wr08(device, NV_PRMDIO_WRITE_MODE_ADDRESS, 0 );
nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, 0 );
nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, 0 );
/* testing blue won't find monochrome monitors. I don't care */
nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, blue);
i = 0 ;
/* take sample pairs until both samples in the pair agree */
do {
if (sample_load_twice(dev, sense_pair))
goto out;
} while ((sense_pair[0 ] != sense_pair[1 ]) &&
++i < MAX_SAMPLE_PAIRS);
if (i == MAX_SAMPLE_PAIRS)
/* too much oscillation defaults to LO */
sense = false ;
else
sense = sense_pair[0 ];
/*
* if sense goes LO before blue ramps to 0 x18 , monitor is not connected .
* ergo , if blue gets to 0 x18 , monitor must be connected
*/
} while (++blue < 0 x18 && sense);
out:
nvif_wr08(device, NV_PRMDIO_PIXEL_MASK, saved_palette_mask);
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_GENERAL_CONTROL, saved_rgen_ctrl);
nvif_wr08(device, NV_PRMDIO_WRITE_MODE_ADDRESS, 0 );
for (i = 0 ; i < 3 ; i++)
nvif_wr08(device, NV_PRMDIO_PALETTE_DATA, saved_palette0[i]);
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_TEST_CONTROL, saved_rtest_ctrl);
NVWriteVgaCrtc(dev, 0 , NV_CIO_CRE_PIXEL_INDEX, saved_pi);
NVWriteVgaCrtc(dev, 0 , NV_CIO_CRE_RPC1_INDEX, saved_rpc1);
NVWriteVgaSeq(dev, 0 , NV_VIO_SR_CLOCK_INDEX, saved_seq1);
NVWriteVgaCrtc(dev, 0 , NV_CIO_CR_MODE_INDEX, saved_cr_mode);
if (blue == 0 x18) {
NV_DEBUG(drm, "Load detected on head A\n" );
return connector_status_connected;
}
return connector_status_disconnected;
}
uint32_t nv17_dac_sample_load(struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
struct nouveau_drm *drm = nouveau_drm(dev);
struct nvif_object *device = &nouveau_drm(dev)->client.device.object;
struct nvkm_gpio *gpio = nvxx_gpio(drm);
struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
uint32_t sample, testval, regoffset = nv04_dac_output_offset(encoder);
uint32_t saved_powerctrl_2 = 0 , saved_powerctrl_4 = 0 , saved_routput,
saved_rtest_ctrl, saved_gpio0 = 0 , saved_gpio1 = 0 , temp, routput;
int head;
#define RGB_TEST_DATA(r, g, b) (r << 0 | g << 10 | b << 20 )
if (dcb->type == DCB_OUTPUT_TV) {
testval = RGB_TEST_DATA(0 xa0, 0 xa0, 0 xa0);
if (drm->vbios.tvdactestval)
testval = drm->vbios.tvdactestval;
} else {
testval = RGB_TEST_DATA(0 x140, 0 x140, 0 x140); /* 0x94050140 */
if (drm->vbios.dactestval)
testval = drm->vbios.dactestval;
}
saved_rtest_ctrl = NVReadRAMDAC(dev, 0 , NV_PRAMDAC_TEST_CONTROL + regoffset);
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_TEST_CONTROL + regoffset,
saved_rtest_ctrl & ~NV_PRAMDAC_TEST_CONTROL_PWRDWN_DAC_OFF);
saved_powerctrl_2 = nvif_rd32(device, NV_PBUS_POWERCTRL_2);
nvif_wr32(device, NV_PBUS_POWERCTRL_2, saved_powerctrl_2 & 0 xd7ffffff);
if (regoffset == 0 x68) {
saved_powerctrl_4 = nvif_rd32(device, NV_PBUS_POWERCTRL_4);
nvif_wr32(device, NV_PBUS_POWERCTRL_4, saved_powerctrl_4 & 0 xffffffcf);
}
if (gpio) {
saved_gpio1 = nvkm_gpio_get(gpio, 0 , DCB_GPIO_TVDAC1, 0 xff);
saved_gpio0 = nvkm_gpio_get(gpio, 0 , DCB_GPIO_TVDAC0, 0 xff);
nvkm_gpio_set(gpio, 0 , DCB_GPIO_TVDAC1, 0 xff, dcb->type == DCB_OUTPUT_TV);
nvkm_gpio_set(gpio, 0 , DCB_GPIO_TVDAC0, 0 xff, dcb->type == DCB_OUTPUT_TV);
}
msleep(4 );
saved_routput = NVReadRAMDAC(dev, 0 , NV_PRAMDAC_DACCLK + regoffset);
head = (saved_routput & 0 x100) >> 8 ;
/* if there's a spare crtc, using it will minimise flicker */
if (!(NVReadVgaCrtc(dev, head, NV_CIO_CRE_RPC1_INDEX) & 0 xC0))
head ^= 1 ;
/* nv driver and nv31 use 0xfffffeee, nv34 and 6600 use 0xfffffece */
routput = (saved_routput & 0 xfffffece) | head << 8 ;
if (drm->client.device.info.family >= NV_DEVICE_INFO_V0_CURIE) {
if (dcb->type == DCB_OUTPUT_TV)
routput |= 0 x1a << 16 ;
else
routput &= ~(0 x1a << 16 );
}
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_DACCLK + regoffset, routput);
msleep(1 );
temp = NVReadRAMDAC(dev, 0 , NV_PRAMDAC_DACCLK + regoffset);
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_DACCLK + regoffset, temp | 1 );
NVWriteRAMDAC(dev, head, NV_PRAMDAC_TESTPOINT_DATA,
NV_PRAMDAC_TESTPOINT_DATA_NOTBLANK | testval);
temp = NVReadRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL);
NVWriteRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL,
temp | NV_PRAMDAC_TEST_CONTROL_TP_INS_EN_ASSERTED);
msleep(5 );
sample = NVReadRAMDAC(dev, 0 , NV_PRAMDAC_TEST_CONTROL + regoffset);
/* do it again just in case it's a residual current */
sample &= NVReadRAMDAC(dev, 0 , NV_PRAMDAC_TEST_CONTROL + regoffset);
temp = NVReadRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL);
NVWriteRAMDAC(dev, head, NV_PRAMDAC_TEST_CONTROL,
temp & ~NV_PRAMDAC_TEST_CONTROL_TP_INS_EN_ASSERTED);
NVWriteRAMDAC(dev, head, NV_PRAMDAC_TESTPOINT_DATA, 0 );
/* bios does something more complex for restoring, but I think this is good enough */
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_DACCLK + regoffset, saved_routput);
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_TEST_CONTROL + regoffset, saved_rtest_ctrl);
if (regoffset == 0 x68)
nvif_wr32(device, NV_PBUS_POWERCTRL_4, saved_powerctrl_4);
nvif_wr32(device, NV_PBUS_POWERCTRL_2, saved_powerctrl_2);
if (gpio) {
nvkm_gpio_set(gpio, 0 , DCB_GPIO_TVDAC1, 0 xff, saved_gpio1);
nvkm_gpio_set(gpio, 0 , DCB_GPIO_TVDAC0, 0 xff, saved_gpio0);
}
return sample;
}
static enum drm_connector_status
nv17_dac_detect(struct drm_encoder *encoder, struct drm_connector *connector)
{
struct nouveau_drm *drm = nouveau_drm(encoder->dev);
struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
if (nv04_dac_in_use(encoder))
return connector_status_disconnected;
if (nv17_dac_sample_load(encoder) &
NV_PRAMDAC_TEST_CONTROL_SENSEB_ALLHI) {
NV_DEBUG(drm, "Load detected on output %c\n" ,
'@' + ffs(dcb->or ));
return connector_status_connected;
} else {
return connector_status_disconnected;
}
}
static bool nv04_dac_mode_fixup(struct drm_encoder *encoder,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
if (nv04_dac_in_use(encoder))
return false ;
return true ;
}
static void nv04_dac_prepare(struct drm_encoder *encoder)
{
const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
struct drm_device *dev = encoder->dev;
int head = nouveau_crtc(encoder->crtc)->index;
helper->dpms(encoder, DRM_MODE_DPMS_OFF);
nv04_dfp_disable(dev, head);
}
static void nv04_dac_mode_set(struct drm_encoder *encoder,
struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)
{
struct drm_device *dev = encoder->dev;
struct nouveau_drm *drm = nouveau_drm(dev);
int head = nouveau_crtc(encoder->crtc)->index;
if (nv_gf4_disp_arch(dev)) {
struct drm_encoder *rebind;
uint32_t dac_offset = nv04_dac_output_offset(encoder);
uint32_t otherdac;
/* bit 16-19 are bits that are set on some G70 cards,
* but don't seem to have much effect */
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_DACCLK + dac_offset,
head << 8 | NV_PRAMDAC_DACCLK_SEL_DACCLK);
/* force any other vga encoders to bind to the other crtc */
list_for_each_entry(rebind, &dev->mode_config.encoder_list, head) {
if (rebind == encoder
|| nouveau_encoder(rebind)->dcb->type != DCB_OUTPUT_ANALOG)
continue ;
dac_offset = nv04_dac_output_offset(rebind);
otherdac = NVReadRAMDAC(dev, 0 , NV_PRAMDAC_DACCLK + dac_offset);
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_DACCLK + dac_offset,
(otherdac & ~0 x0100) | (head ^ 1 ) << 8 );
}
}
/* This could use refinement for flatpanels, but it should work this way */
if (drm->client.device.info.chipset < 0 x44)
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0 xf0000000);
else
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0 x00100000);
}
static void nv04_dac_commit(struct drm_encoder *encoder)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct nouveau_drm *drm = nouveau_drm(encoder->dev);
struct nouveau_crtc *nv_crtc = nouveau_crtc(encoder->crtc);
const struct drm_encoder_helper_funcs *helper = encoder->helper_private;
helper->dpms(encoder, DRM_MODE_DPMS_ON);
NV_DEBUG(drm, "Output %s is running on CRTC %d using output %c\n" ,
nv04_encoder_get_connector(nv_encoder)->base.name,
nv_crtc->index, '@' + ffs(nv_encoder->dcb->or ));
}
void nv04_dac_update_dacclk(struct drm_encoder *encoder, bool enable)
{
struct drm_device *dev = encoder->dev;
struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
if (nv_gf4_disp_arch(dev)) {
uint32_t *dac_users = &nv04_display(dev)->dac_users[ffs(dcb->or ) - 1 ];
int dacclk_off = NV_PRAMDAC_DACCLK + nv04_dac_output_offset(encoder);
uint32_t dacclk = NVReadRAMDAC(dev, 0 , dacclk_off);
if (enable) {
*dac_users |= 1 << dcb->index;
NVWriteRAMDAC(dev, 0 , dacclk_off, dacclk | NV_PRAMDAC_DACCLK_SEL_DACCLK);
} else {
*dac_users &= ~(1 << dcb->index);
if (!*dac_users)
NVWriteRAMDAC(dev, 0 , dacclk_off,
dacclk & ~NV_PRAMDAC_DACCLK_SEL_DACCLK);
}
}
}
/* Check if the DAC corresponding to 'encoder' is being used by
* someone else. */
bool nv04_dac_in_use(struct drm_encoder *encoder)
{
struct drm_device *dev = encoder->dev;
struct dcb_output *dcb = nouveau_encoder(encoder)->dcb;
return nv_gf4_disp_arch(encoder->dev) &&
(nv04_display(dev)->dac_users[ffs(dcb->or ) - 1 ] & ~(1 << dcb->index));
}
static void nv04_dac_dpms(struct drm_encoder *encoder, int mode)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct nouveau_drm *drm = nouveau_drm(encoder->dev);
if (nv_encoder->last_dpms == mode)
return ;
nv_encoder->last_dpms = mode;
NV_DEBUG(drm, "Setting dpms mode %d on vga encoder (output %d)\n" ,
mode, nv_encoder->dcb->index);
nv04_dac_update_dacclk(encoder, mode == DRM_MODE_DPMS_ON);
}
static void nv04_dac_save(struct drm_encoder *encoder)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct drm_device *dev = encoder->dev;
if (nv_gf4_disp_arch(dev))
nv_encoder->restore.output = NVReadRAMDAC(dev, 0 , NV_PRAMDAC_DACCLK +
nv04_dac_output_offset(encoder));
}
static void nv04_dac_restore(struct drm_encoder *encoder)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
struct drm_device *dev = encoder->dev;
if (nv_gf4_disp_arch(dev))
NVWriteRAMDAC(dev, 0 , NV_PRAMDAC_DACCLK + nv04_dac_output_offset(encoder),
nv_encoder->restore.output);
nv_encoder->last_dpms = NV_DPMS_CLEARED;
}
static void nv04_dac_destroy(struct drm_encoder *encoder)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
drm_encoder_cleanup(encoder);
kfree(nv_encoder);
}
static const struct drm_encoder_helper_funcs nv04_dac_helper_funcs = {
.dpms = nv04_dac_dpms,
.mode_fixup = nv04_dac_mode_fixup,
.prepare = nv04_dac_prepare,
.commit = nv04_dac_commit,
.mode_set = nv04_dac_mode_set,
.detect = nv04_dac_detect
};
static const struct drm_encoder_helper_funcs nv17_dac_helper_funcs = {
.dpms = nv04_dac_dpms,
.mode_fixup = nv04_dac_mode_fixup,
.prepare = nv04_dac_prepare,
.commit = nv04_dac_commit,
.mode_set = nv04_dac_mode_set,
.detect = nv17_dac_detect
};
static const struct drm_encoder_funcs nv04_dac_funcs = {
.destroy = nv04_dac_destroy,
};
int
nv04_dac_create(struct drm_connector *connector, struct dcb_output *entry)
{
const struct drm_encoder_helper_funcs *helper;
struct nouveau_encoder *nv_encoder = NULL;
struct drm_device *dev = connector->dev;
struct drm_encoder *encoder;
nv_encoder = kzalloc(sizeof (*nv_encoder), GFP_KERNEL);
if (!nv_encoder)
return -ENOMEM;
encoder = to_drm_encoder(nv_encoder);
nv_encoder->dcb = entry;
nv_encoder->or = ffs(entry->or ) - 1 ;
nv_encoder->enc_save = nv04_dac_save;
nv_encoder->enc_restore = nv04_dac_restore;
if (nv_gf4_disp_arch(dev))
helper = &nv17_dac_helper_funcs;
else
helper = &nv04_dac_helper_funcs;
drm_encoder_init(dev, encoder, &nv04_dac_funcs, DRM_MODE_ENCODER_DAC,
NULL);
drm_encoder_helper_add(encoder, helper);
encoder->possible_crtcs = entry->heads;
encoder->possible_clones = 0 ;
drm_connector_attach_encoder(connector, encoder);
return 0 ;
}
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